Ancient egyptians lived throughout the nile river valley and delta, shielded on all sides by deserts, seas, mountains and rapids. to the east, a small desert separates the river valley from the red sea to the north, the mediterranean sea separated the egyptians from european people, while mountains and rushing rapids protected the south?

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.